6th forms

Am moving to London summer 2014, daughter starting 6th form September 2014. wants academic school for A levels. Trouble is we 'know which part of London we will be moving to yet. Any suggestions or recomedations gratefully received state or independent.

What grades is she predicted in GCSEs? Look on websites to see any closing dates. Does she have a say? What is she looking for? Is it important the size of school, single sex or co-ed, urban or more outer London feel?